1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __ASM_NMI_H 3 #define __ASM_NMI_H 4 5 #include <linux/cpumask.h> 6 7 struct pt_regs; 8 9 /* 10 * Cross-CPU NMI provider hooks, consulted by the arm64 arch code before 11 * its regular-IRQ / pseudo-NMI IPI paths. The SDEI provider in 12 * drivers/firmware/arm_sdei_nmi.c implements them when active; a future 13 * FEAT_NMI provider could slot in here too. The stubs let callers stay 14 * unconditional when ARM_SDEI_NMI is off. 15 * 16 * sdei_nmi_active() lets a caller test for the service before committing 17 * to (and waiting on) the SDEI stop rung; sdei_nmi_stop_cpus() then signals 18 * the targets, which ack by going offline. 19 */ 20 #ifdef CONFIG_ARM_SDEI_NMI 21 bool sdei_nmi_trigger_cpumask_backtrace(const cpumask_t *mask, int exclude_cpu); 22 bool sdei_nmi_active(void); 23 void sdei_nmi_stop_cpus(const cpumask_t *mask); 24 #else 25 static inline bool sdei_nmi_trigger_cpumask_backtrace(const cpumask_t *mask, 26 int exclude_cpu) 27 { 28 return false; 29 } 30 31 static inline bool sdei_nmi_active(void) 32 { 33 return false; 34 } 35 36 static inline void sdei_nmi_stop_cpus(const cpumask_t *mask) { } 37 #endif 38 39 /* 40 * The common "stop this CPU" entry every arm64 stop path funnels through: 41 * the regular/pseudo-NMI stop IPI handlers, panic_smp_self_stop(), and the 42 * SDEI cross-CPU NMI handler. @die_on_crash powers the CPU off on the kdump 43 * crash path (IPI handlers) instead of parking it (SDEI / self-stop). 44 * Defined in arch/arm64/kernel/smp.c. 45 */ 46 void __noreturn arm64_nmi_cpu_stop(struct pt_regs *regs, bool die_on_crash); 47 48 #endif /* __ASM_NMI_H */ 49